1988 GMC R2500 Service and Repair Manual

This factory service and repair manual for the 1988 GMC R2500 is written for the four-door crew cab pickup in Base, High Sierra and Sierra Classic trim, with four naturally aspirated overhead-valve engines listed: a 7.4L V8 of 454 cubic inches, a 6.2L diesel V8, a 4.8L inline-six of 292 cubic inches and a 5.7L V8. The crew cab is the only body listed, which keeps the book focused on engine, driveline, chassis and body electrical work, each with procedures, specifications, torque values, wiring diagrams and diagnostics.

Engines covered

• 7.4L V8 (454 cu in) — OHV, naturally aspirated, gasoline
• 6.2L V8 (379 cu in) — OHV, naturally aspirated, diesel
• 4.8L inline-six (292 cu in) — OHV, naturally aspirated, gasoline
• 5.7L V8 (350 cu in) — OHV, naturally aspirated, gasoline

Body styles covered

• 4-door crew cab pickup

Trims covered

• Base
• High Sierra
• Sierra Classic

Known issues on the 1988 R2500. Ordinary maintenance and repair on a truck offered with a 454 cubic inch gasoline V8 at one end and a 292 cubic inch inline-six at the other means very different figures for the same job. The manual keeps them separate and adds brake, steering, suspension and axle procedures, torque values, wiring diagrams and diagnostics for the chassis all four engines share.